[Foreign 2009] [Delhi 2011; All India 2008] You can see some Coulomb's Law Class 12 Notes | EduRev sample questions with examples at the bottom of this page. [Delhi2014c] [Delhi 2012] Electric dipole moment of an electric dipole is equal to the product of its charges and the length of the electric dipole.It is denoted by p. Its unit is coulomb-metre. Give definition of unit charge using this law. A ball is thrown from the top of a building with an initial speed of 8 m/s at an angle of... 1. (ii) Awareness and humanity The Punjab Board of Intermediate and Secondary Education BISE PUNJAB BOARD Physics Online Test for the 12th Class Model Paper Chapter No 01 has been provided for the Preparations. 7.A proton is placed in a uniform electric field directed along the position X-axis. question_answer12) Out of gravitational, electromagnetic, Vander Waals, electrostatic and nuclear forces; which two are able to provide an attractive force between two neutrons [NCERT 1978] Ans.Since, torque (x) on the dipole in electric field E is. 23.Two identical metallic spherical shells A and B having charges + 40 and -10Q are kept a certain distance apart. According to Coulomb's Law, the top arrangement is the only one that will produce a net force on the central charge. NOTE The line joining the two charges-q and + q is called the dipole axis. Obtain the expression for (i) the magnitude and (ii) the direction of the resultant electric field at the vertex A due to these two charges. In region II It is a vector quantity and its direction is from negative charge towards positive charge, 6.Draw a plot showing the variation of electric field (E) with distance r due to a point charge Q. QP = +10 μC and Qq = +20 μC are separated by a distance r = 10 cm. [Delhi 2013; VBQ] Two objects m1 and m2 each with a mass of 6 kg and 9 kg separated by a distance of 5... 1. 2. independent of the other charges. The constant k = 8.988 x 109 Nm2C Thus, in order to stable spacing, the         lines are normal to the surface. An object vibrates with a frequency of 5 Hz to rightward and leftward. (iv)Give an example of similar action on your part in the past from everyday life. 36.While travelling back to his residence in the car, Dr. Pathak was caught up in a thunderstorm. The object moves from equilibrium point to the... = -5 μC, are separated by a distance r = 10 cm. shown in the figure. 18.Electric Dipole Moment The strength of an electric dipole is measured by a vector quantity known as electric dipole moment (p) which is the product of the charge (q) and separation between the charges (2l). Ans.Refer to ans. It is a vector quantity and its direction is from negative charge towards positive charge (i) Point charge (+Q) is kept in the vicinity of and uncharged conducting plate. Answer: Coulomb’s Law Each electric charge affects its surroundings. 26.Deduce the expression for the electric field E due to a system of two charges qx and q2 with position vectors i1 and r2 at a point r with respect to common origin. 28.Figure shows two large metal plates and P2 tightly held against each other and placed between two equal and unlike point charges perpendicular to the line joining them. Write the magnitude and directions of net fields on the marked II and III. Suddenly, he noticed a child walking alone on the road. (easy) A point charge (q 1) has a magnitude of 3x10-6 C. A second charge (q 2) has a magnitude of -1.5x10-6 C and is located 0.12m from the first charge. Deduce an expression for the electric field at a point on the equatorial plane of an electric dipole of length 2a. (i)Prove that no translation force acts on the dipole. Therefore, we consider them as point charges as it becomes easy for us to calculate the force of attraction/ repulsion between them. [Foreign 2012; All India 2011] Ans. Also write its limitations. [Foreign 2008] Conservation of mechanical energy – problems and solutions. What is the magnitude of the, Momentum and impulse – problems and solutions, 2. Please keep a pen and paper ready for rough work but keep your books away. If  l<